Artificial Peak Laser Absorption Spectroscopy: Simultaneous Quantification of Temperature and Concentration with...

Area of Science:

• Spectroscopy
• Laser-based sensing
• Physical chemistry

Background:

• Laser absorption spectroscopy (LAS) faces a dynamic range-sensitivity trade-off.
• Multiparameter measurements in LAS often require specific absorption line pairs.
• Existing methods struggle with accuracy in extreme environments.

Purpose of the Study:

• To develop a calibration-free LAS technique overcoming dynamic range limitations.
• To enable simultaneous temperature and concentration quantification.
• To eliminate the need for specific absorption line pairs in multiparameter LAS.

Main Methods:

• Implementation of an artificial peak-laser absorption spectroscopy (AP-LAS) technique.
• Utilizing a signal-driven and wavelength-tuning mechanism.
• Generating artificial absorption peaks within a single natural spectral line.

Main Results:

• Validated AP-LAS technique through CO absorption experiments in a shock tube.
• Extended the detectable concentration range by 4 times compared to conventional methods.
• Maintained excellent linearity and enhanced dynamic range.

Conclusions:

• AP-LAS technique offers superior performance for multiparameter quantification under extreme conditions.
• The method eliminates reliance on matched absorption line pairs.
• AP-LAS is a promising solution for real-time gas monitoring in demanding applications like combustion diagnostics.